| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice amplifying apparatus which acquires necessary voice outputs even though it is compact and can amplify only voice bands without requiring energy for voice amplifying and forming an electrical amplifying circuit. SOLUTION: A hollow part is provided in the direction facing to a vibration board of a speaker, and voice bands that are output from the speaker are resonated to acquire a necessary band and output voice to the outside of the voice amplifying apparatus through an output opening part. COPYRIGHT: (C)2007,JPO&INPIT
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